condition mean min max ZT0-3 2.80195730775 1.8999924540000002 3.7039221614999995 ZT4-7 4.6963870205 4.6932177374999995 4.6995563035000005 ZT8-11 12.56819246375 9.7569432875 15.37944164 ZT12-15 17.897217089999998 17.18120279 18.61323139 ZT16-19 15.070321392500002 14.281602635 15.859040150000002 ZT20-23 14.1480574725 13.454835795 14.84127915